Remove parts of //cc we aren't using

cc/layers/contents_scaling_layer.cc

-// Copyright 2012 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#include "cc/layers/contents_scaling_layer.h"
-#include "ui/gfx/geometry/size_conversions.h"
-
-namespace cc {
-
-gfx::Size ContentsScalingLayer::ComputeContentBoundsForScale(
-    float scale_x,
-    float scale_y) const {
-  return gfx::ToCeiledSize(gfx::ScaleSize(bounds(), scale_x, scale_y));
-}
-
-ContentsScalingLayer::ContentsScalingLayer()
-    : last_update_contents_scale_x_(0.f),
-      last_update_contents_scale_y_(0.f) {}
-
-ContentsScalingLayer::~ContentsScalingLayer() {
-}
-
-void ContentsScalingLayer::CalculateContentsScale(
-    float ideal_contents_scale,
-    float* contents_scale_x,
-    float* contents_scale_y,
-    gfx::Size* content_bounds) {
-  *contents_scale_x = ideal_contents_scale;
-  *contents_scale_y = ideal_contents_scale;
-  *content_bounds = ComputeContentBoundsForScale(
-      ideal_contents_scale,
-      ideal_contents_scale);
-}
-
-bool ContentsScalingLayer::Update(ResourceUpdateQueue* queue,
-                                  const OcclusionTracker<Layer>* occlusion) {
-  bool updated = Layer::Update(queue, occlusion);
-
-  if (draw_properties().contents_scale_x == last_update_contents_scale_x_ &&
-      draw_properties().contents_scale_y == last_update_contents_scale_y_)
-    return updated;
-
-  last_update_contents_scale_x_ = draw_properties().contents_scale_x;
-  last_update_contents_scale_y_ = draw_properties().contents_scale_y;
-  // Invalidate the whole layer if scale changed.
-  SetNeedsDisplayRect(gfx::Rect(paint_properties().bounds));
-  return updated;
-}
-
-}  // namespace cc